Vacation Sinking-Fund Calculator

Save for Your Next Trip Without Stress

A target without a weekly number is a wish. Dividing the cost by the weeks left turns it into something you either are or are not doing, and the figure is usually smaller than expected: a 3,000 trip a year out comes to under 50 a week once a little interest is doing its share. The structure has a name, the sinking fund, and it predates holidays by some centuries.

How Growth Helps Your Savings

Money set aside for a dated goal sits somewhere, and where it sits changes the total slightly. At 4 per cent over a year the interest covers about 49 of the 2,500 still needed, so the contributions come to 2,451.29 rather than the full gap. It is a small effect at these horizons and a larger one as the runway lengthens, which is an argument for starting early rather than for chasing a rate.

Interpreting Results

The weekly figure is what closes the gap if every week is the same. Real saving is lumpier, so the number reads better as an average to hit than an instruction to follow: a month of putting nothing aside means the remaining weeks carry more. The daily and monthly rows are the same figure at different resolutions, for whichever one matches how money actually moves.

Common Things People Overlook

Flights and accommodation are where the estimate usually stops. Travel insurance, transfers, food, activities and the things bought because you are there all land on top, and they are the part that varies most between the plan and the trip. A total with a buffer already in it produces a weekly figure that survives contact with the holiday; the flights alone produce one that does not.

Starting Small Still Counts

An existing balance does a disproportionate amount of the work. At the defaults, 500 already put by drops the weekly figure from 56.57 to 47.14, a sixth of the effort removed by money that is simply sitting there.

Quick example

With the defaults, a 3,000 trip 52 weeks out, 500 already saved and a 4 per cent rate: 47.14 a week, or 6.73 a day, or 204.27 a month. The contributions total 2,451.29 against a 2,500 gap, the difference being interest.

Which inputs matter most

Total Trip Cost and Weeks Until Trip are the two that move it most, and they move it in opposite directions: doubling the cost roughly doubles the weekly figure, while doubling the weeks roughly halves it. Already Saved is the quickest of the four to change for anyone with a balance to point at it. The rate matters least at these horizons, since dropping it to zero moves the weekly figure only from 47.14 to 48.08.

What's happening under the hood

Existing savings are subtracted from the trip cost to give the amount still needed. That amount is then divided by the future value of a weekly annuity at the weekly rate, which gives the contribution that compounds to exactly the gap. Where the rate is zero the calculation becomes a plain division by the weeks. Existing savings are not projected forward, which makes the result slightly conservative.

Why see the number at all

An undated goal competes badly with everything that has a date. Rent has a date, a subscription has a date, a holiday twelve months out has none until the money starts moving. Putting a weekly figure on it supplies one, and that figure is often what reveals whether the trip as specified is the trip that fits.

What this doesn't capture

Prices change between booking and travelling, and rarely downward. It assumes contributions are equal and uninterrupted, which few are. It does not model the account the money sits in, so a rate that turns out to be promotional or taxed will move the answer. And it prices the trip entered, which is not always the trip taken.